Sonic Tunneling Tool

Equip the sonic tunneling tool in your toy slot, and you can move just below the surface instead of running. The tunneling wave is fragile, though, and you will surface if hit.

This item has no movement speed bonus or additional skills.

— In-game description

The Sonic Tunneling Tool is a travel item and can be used to "tunnel" around, changing the movement animation. It does not increase the speed of the player. While tunneling players are still restricted by obstacles and can still be attacked. Being attacked stops tunneling.